Infamous drug lord Rafael Caro Quintero walked free Friday after 28 years in prison when a court overturned his 40-year sentence for the 1985 kidnapping and killing of a U.S. Drug Enforcement Administration agent, a brutal murder that marked a low point in U.S.-Mexico relations.

The U.S. Department of Justice said Friday it was extremely disappointed by the release of the man convicted in the killing of DEA agent Enrique Camarena, calling it 'deeply troubling.'

Mexico’s Attorney General Jesus Murillo Karam said in a statement that he was 'worried' about the court’s decision, adding that his office is analyzing whether there are any charges pending against Caro Quintero.

Released: Drug kingpin Rafael Caro Quintero was released from prison today after a court ruled his 1985 murder conviction needed to be tossed out

Caro Quintero, 60, was a founding member of one of Mexico’s earliest and biggest drug cartels. The court ruled Wednesday that he had been improperly tried in a federal court for a crime that should have been treated as a state offense. Prison officials were notified of the ruling on Thursday, and an official at the Jalisco state prosecutors’ office said the drug lord left prison before dawn on Friday. The official was not authorized to speak on the record.

News media were not alerted until hours after the release, and U.S. authorities apparently received no prior notification.

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'The Department of Justice and the Drug Enforcement Administration learned today that early this morning Rafael Caro Quintero was released from prison,' said Justice Department spokesman Peter Carr.

The DEA, meanwhile, said it 'will vigorously continue its efforts to ensure Caro-Quintero faces charges in the United States for the crimes he committed.'

Caro Quintero still faces charges in the United States, but Mexico’s Attorney General’s Office said it was unclear whether there was a current extradition request.

Hero: Slain DEA Agent Enrique Camarena is considered amongst his colleagues to be an original hero in the war on drug cartels

Apparently, the U.S. had requested his extradition for the Camarena killing — something Caro Quintero can’t be tried twice for — but may not have filed extradition requests for pending U.S. drug charges.

The U.S. Department of Justice said it 'has continued to make clear to Mexican authorities the continued interest of the United States in securing Caro Quintero’s extradition so that he might face justice in the United States.'

Caro Quintero helped establish a powerful cartel based in the northwestern Mexican state of Sinaloa that later split into some of Mexico’s largest cartels, including the Sinaloa and Juarez cartels.

He is still listed as one of the DEA’s five top international fugitives, and U.S. authorities believe he continued to control the laundering of drug money from behind bars.

'Caro Quintero continues to launder the proceeds from narcotics trafficking and he maintains an alliance with drug trafficking organizations such as the Sinaloa Cartel, most notably with Esparragoza Moreno’s network,' said Treasury Department spokesman John Sullivan, referring to Juan Jose Esparragoza Moreno, also known as 'El Azul,' or 'Blue' because of the dark color of his skin, who is allegedly a top leader of the Sinaloa cartel.

28 Years: Quintero spent 28 years behind bars before he was released on a technicality Friday morning

In June, the Treasury Department imposed sanctions against 18 people and 15 companies that allegedly moved money for Caro Quintero.

Caro Quintero has used a network of family members and front persons to invest his fortune into ostensibly legitimate companies and real estate projects in the city of Guadalajara' said Adam Szubin, Director of Treasury’s Office of Foreign Assets Control. Caro Quintero has spent almost his entire sentence at a prison on the outskirts of that city, Mexico’s second-largest city.

Mexico’s relations with Washington were badly damaged when Caro Quintero ordered Camarena kidnapped, tortured and killed, purportedly because he was angry about a raid on a 220-acre (89-hectare) marijuana plantation in central Mexico named 'Rancho Bufalo' — Buffalo Ranch — that was seized by Mexican authorities at Camarena’s insistence.

Camarena was kidnapped on Feb. 7, 1985, in Guadalajara, a major drug trafficking center. His body and that of his Mexican pilot, both showing signs of torture, were found a month later, buried in shallow graves.

American officials accused their Mexican counterparts of letting Camarena’s killers get away. Caro Quintero was eventually hunted down in Costa Rica.

At one point, U.S. Customs agents almost blocked the U.S. border with Mexico, slowing incoming traffic to a standstill while conducting searches of all Mexicans trying to enter the United States.

Camarena’s fellow DEA agents considered him a hero in the war against drug trafficking and the El Paso Intelligence Center, where U.S. federal agencies collect information about Mexican drug barons, is dedicated to him.

Times have changed since the low point, and
cooperation has strengthened, but Caro Quintero’s release Friday
reopened old wounds.

Prison: Quintero spent the majority of his time behind bars at this prison in Guadalajara

Edward Heath, the former DEA
regional director for Mexico at the time of the Camarena killing who was
present during the identification of the agent’s body from dental
records, said the release reflected a broader lack of cooperation with
the U.S. from the new Mexican government, a contrast to the policy of
former President Felipe Calderon.

'You had a president that was
working very close with our government in a quiet way. These people come
in and so, boom, the curtain comes down,' said Heath, now a private
security consultant. 'It means a disrespect for our government.'

He said he was skeptical of the explanation that there was a justifiable legal rationale for Caro Quintero’s release.

'There’s some collusion going on,' he said. 'This guy is a major trafficker. This guy is bad, a mean son of a gun.'

Caro Quintero is said to have
pioneered links between Colombian cocaine cartels and the Mexican
smugglers who transport their drugs into the United States.

The ruling left many wondering why it took so many years for judges to determine Caro Quintero was tried in the wrong court.

'They were always ''political''
prisoners serving sentences for as long as the U.S. kept up the
pressure,' said a former DEA official who once worked in Mexico. He is
not authorized to talk about the case because he still does work in
Mexico.

Road to freedom: Mexican officials travel to the prison to inform Quintero that he is to be released

'The bribe money to get them out
was always there. Mexican ''justice'' is always built on very weak
foundations. And they seem to like it that way. Sad,' he added.

Raul Benitez, a security expert at
Mexico’s National Autonomous University, said the ruling may portend
more such procedural rulings following the January freeing of French
citizen Florence Cassez, who was convicted in Mexico for being part of a
kidnapping ring.

The Frenchwoman served seven years
of a 60-year sentence before Mexico’s Supreme Court voted 3-2 to
release her in January because of procedural and rights violations
during her arrest, including police staging a recreation of her capture
for the media.

'What appears to be coming is an
avalanche of judicial appeals, with the drug traffickers hiring very
good, very expensive lawyers, arguing there were violations of due
process,' said Benitez. 'The government is going to have problems.'

Mexican courts and prosecutors
have long tolerated illicit evidence such as forced confessions and have
frequently based cases on questionable testimony or hearsay. Such
practices have been banned by recent judicial reforms, but past cases —
including those against high-level drug traffickers — are often rife
with such legal violations.

'The government has to be
prepared to keep an eye on judges so that they don’t fall into the easy
argument of due process,' Benitez said, 'because there may also be
judges who are receiving money' to accept such arguments.